diff --git a/src/controllers/registrationfee.ts b/src/controllers/registrationfee.ts
index 4863288..20d2d09 100644
--- a/src/controllers/registrationfee.ts
+++ b/src/controllers/registrationfee.ts
@@ -15,7 +15,7 @@ const log: Logger<ILogObj> = new Logger({
 });
 
 const RegistrationFeeCreateAndUpdateSchema = {
-    service: Joi.array().items(Joi.string()).optional().label("Service"),
+    service: Joi.array().items(Joi.string().allow(null,"").uuid()).optional().label("Service"),
     type: Joi.string().valid("emergency", "outpatient").required().label("Type"),
 };